增广矩阵=
1 -2 -1 1 0
1 1 -1 -3 2
1 -2 -1 3 -1
用初等行变换化为
1 0 -1 0 1/2
0 1 0 0 0
0 0 0 1 -1/2
方程组的全部解为:(1/2,0,0,-1/2)^T+k(1,0,1,0)^T
增广矩阵=
1 -2 -1 1 0
1 1 -1 -3 2
1 -2 -1 3 -1
用初等行变换化为
1 0 -1 0 1/2
0 1 0 0 0
0 0 0 1 -1/2
方程组的全部解为:(1/2,0,0,-1/2)^T+k(1,0,1,0)^T